Map of the World using the Grid System

The world's surface is divided into 536 large squares from which 465 are "regular". Regular squares can be divided
into 81 by 81 small squares, with identical size. The remaining 71 large squares are "irregular", which means the
sub squares within don't follow general rules and may differ in numbers. The map below shows all large squares,
where green ones are proven in terms of their internal structure, while red ones are not.